In the transportation of hydrogen using pipelines, existing oil and natural gas pipelines can be retrofitted with inner tubes defining an inter-space between the outer surface of the inner tubes and the pipelines, and providing a fluid at in the inter-space at a higher pressure than that of the hydrogen in carried in inner tube.

A plug-in coupling has a coupling plug and a coupling socket. The coupling plug has an inner and an outer pipe piece and a first attachment flange and is connected to the first cryogenic line. The coupling socket has an inner and an outer pipe piece and a second attachment flange and is connected to the second cryogenic line. A circular annular seal on the distal end of the coupling plug is of electrically insulating form. An insulating sleeve is arranged on the outer pipe piece of the coupling plug. An insulating disc is situated between the first and the second attachment flange when the coupling plug has been inserted into the coupling socket. The plug-in coupling realizes a galvanic is separation between the coupling plug and the coupling socket.

A fuel tube protector for a vehicle includes a protective member configured to surround a circumferential surface of a fuel tube disposed between a fuel tank and an internal combustion engine, and a fixing member provided at both distal ends of the protective member to fix the protective member to the fuel tube, wherein each fixing member includes a body surrounding and holding the circumferential surface of the fuel tube, and first fixing legs protruding from a side surface of the body and fastened to the respective distal end of the protective member.

Provided is a chemical injection system for connection to a chemical tank and a process line. The system includes a pump box configured to attach to the tank, the pump box including a body defining an interior, a pump assembly disposed within the interior of the body of the pump box, and an injection assembly configured to be fluidly coupled to the pump box. The injection assembly includes an injection lance having a flange and a stem, a first seal abutting a first side of the flange of the injection lance, and a second seal abutting a second side of the flange of the injection lance.

A fluid pipe connection is disclosed having an inner pipe assembly including a first inner pipe section and a second inner pipe section, and an inner joint between the first inner pipe section and second inner pipe section; an outer pipe assembly having a first outer pipe section, a second outer pipe section, a shroud covering the inner joint and mechanically connecting the first outer pipe section to the second outer pipe section via a mechanical connection, and a hatch fastened to the shroud by one or more fasteners and covering a hole in the shroud, wherein the hatch is moveable between a closed position and an open position to provide access to the inner joint through the hole.

A system includes first and second hose segments and a first junction device. The first hose segment includes first inner and outer hoses. The second hose segment includes second inner and outer hoses. The first junction device includes a first body including first and second chambers and a selectively openable hatch disposed on at least one of the first and second chambers. The first outer hose is fluidly connected to first chamber. The second outer hose is fluidly connected to the second chamber. The first and second inner hoses are fluidly connected. Outside of the first and second inner hoses, interiors of the first and second chambers are fluidly isolated from each other. A method of transporting liquid over land comprises connecting a first hose segment to a liquid source and connecting first and second hose segments to a first junction device.

A tank system may be conventional and fixed, or mobile, such as a fracking fluid or other tank trailer. A drain port thereof is fitted with an adapter connecting a snorkel system to drain liquids from near the top of the liquid level in the tank. A snorkel head at the extreme distal end of a tube near the longitudinal center of the tank is suspended by a system of buoys. A flow field controller plate resists formation of vortices near the snorkel head, so it can operate as near the surface as possible, withdrawing the highest grade oil efficiently. At its exit, the proximal end of the tube drains oil through an inner conduit of an adapter at a penetration in the wall of the tank. The adapter forms an annulus around the inner conduit draining tank bottoms directly from the tank.

An attachment device, comprising a first line connector with a first fluid passage and a second line connector. The second line connector surrounds the first line connector such that a second fluid passage is created between the first line connector and the second line connector. The second fluid passage is fluidically separated from the first fluid passage. The second line connector can be pushed onto the first line connector from the end thereof situated opposite the hose attachment of the first line connector. The attachment is arranged in a line comprising the attachment device connected using a corresponding connection method.

A termination fitting assembly for use with a conduit includes the conduit comprising a primary pipe positioned centrally within a secondary pipe along a longitudinal axis of the conduit and the conduit having an interstitial space defined between the primary pipe and secondary pipe. The termination fitting assembly includes an interior fitting having an inner wall and an outer wall, the inner wall sized and shaped for insertion into and sealing with the primary pipe, and the outer wall extending circumferentially around the secondary pipe of the conduit. The termination fitting assembly includes an annular channel defined between the inner wall and the outer wall of the interior fitting and in fluid communication with the interstitial space of the conduit and an exterior fitting positioned around the conduit.

A flexible dual duct coupling, comprising: a coupling body having an inner flow passage and an outer flow passage therethrough; a first nut assembly configured for reversible attachment to the coupling body; and, a second nut assembly configured for reversible attachment to the coupling body, wherein the second nut assembly is opposite the first nut assembly.